def add(a, b):
    c = a + b
    print(c)
    return c


def sub(a, b):
    c = a - b
    print(c)
    return c


def mul(a, b):
    c = a * b
    print(c)
    return c


def div(a, b):
    c = a / b
    print(c)
    return c